forthcoming video interview

I’ve been asked to do an interview on AT&T’s Tech Channel.  I’m no Steven Bellovin, but what the heck.  It’ll be recorded in NYC on 11 November 2010, the day before NYCBSDCon starts.  No idea when it’ll actually be available.

The TechChannel shows are available online.  It seems that they’re also used as content snippets in real TV shows.  One day, if I’m lucky, my head will appear on a TV near you, with a text label beneath it and my words taken completely out of context.  Probably in a faux-reality TV show about ghost hunting or something.  Ah, fame at last…

Network collisions running hosts under KVM

I use KVM and OpenNebula on Ubuntu for virtualization. Getting such a cluster up and running is easy, but making it perform well takes much more work.  Many times, the statement “my virtualization cluster works well” is equivalent to “I’m not paying attention.”  My FreeBSD hosts help point out problems, though.  All of my FreeBSD servers send me a daily email to tell me they’re still alive and to point out potential issues.  That’s how I found out I was getting network collisions on my virtualized hosts, and here’s how I investigated them. Continue reading “Network collisions running hosts under KVM”

Short story by yours truly published

My short story Wednesday’s Seagulls was just posted on

For those who wonder why I don’t publish more fiction:  I have this weird idea that I should get paid for my work.  The amount doesn’t matter a great deal — this story made enough for a couple of hot fudge sundaes.  The Internet has made “getting published” almost meaningless, but:  if a piece of writing isn’t good enough that someone will buy it, I don’t want it out there with my name on it.

I’d much rather have less work available of higher quality than publish reams of sewage.

The unexpected risks of ebooks

Yesterday’s biannual royalty statement contained an unexpected surprise:  it included ebook royalties for Absolute BSD (published in 2002) and the first edition of Cisco Routers for the Desperate (published in 2004).  Both are out of print, and have newer editions.  While the royalties for these books played out over several years, I certainly never expected to see any new sales of either of these books.

It turns out that both of these are available through ebook licensing services, such as

This leaves me with mixed feelings.  There’s no real cost to having ebooks available.  For all I know, someone has a serious, legitimate need for high-quality documentation on FreeBSD 4.  Reliable documentation from that era is hard to find, and you have dig to find answers.  I don’t want to forbid people from buying it.

But I suspect that most people who buy these older ebooks made a mistake.  They really wanted the newer editions.

In my mind, the obvious thing to do is to have the licensing service put up a warning along the lines of “This ebook is obsolete.  You probably want this other book.”  That’s what my publisher’s online bookstore does.  But licensing services are independent companies.  I can’t dictate to them.

I could tell my publisher to rescind all rights to sell these older books, and force to remove them from their catalog, and to heck with people who need documentation for older kit.

What do you think?

Finding a SIP DoS attack via flow analysis

I’m leaving my getting hit in the head lesson when the boss calls.  Some unmentionable orifice is firing DOS attacks at a couple of our SIP servers.  My mission, should I choose to accept it, is to find and block the attackers.  (Should I choose to not accept it, then my mission will be to listen to Fearless Leader whine about it.  I can’t stand whining.)  Fortunately, I have flow data for one of the servers under attack. Continue reading “Finding a SIP DoS attack via flow analysis”

Proposal accepted for NYCBSDCon

NYCBSDCon accepted my talk proposal:

BSD Needs Books

If you wander into any bookstore, brick or virtual, you’ll see books on Linux, Solaris, Macintosh, and even non-Unix-like operating systems.  The BSD books are far between.  We as a community need to address this if we’re to expand our reach.

This talk covers designing, selling, writing, and promoting your own technical book, with a special emphasis on BSD books.  I’ll cover everything that I wished I’d known before I started, common errors, where the “generally accepted wisdom” is wrong, how to actually complete the book, how you can use your publisher to your advantage, post-publication work, and — most important — how to enjoy the process.

I’ve attended NYCBSDCon repeatedly, and have never been disappointed.  They always have interesting content and the after-hours events are fabulous.  (Yes, I like BSDCan as well, but there is no place in the world like New York City.)

Now to figure out how I do what I do…